Bradley underwent a pair of off-season shoulder surgeries after battling through a number of dislocations in his left shoulder at the end of the season and in the playoffs. He also had his right shoulder repaired over the summer.

Bradley emerged in the second-half of last season, and finished the year as Boston’s starting two-guard. He averaged 7.6 points and 1.4 assists per game, shooting 50-percent from the floor.

While the Celtics lost Ray Allen to free agency, they bulked up their back court with guards Jason Terry and Courtney Lee. Lee will start in Bradley’s absence, which could lead to more minutes for Dionte Christmas, who the Celtics signed after a strong performance in the Summer League.